<template>
	<view class="u-wrap">
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
				<view v-for="(item,index) in navlist" :key="index" class="u-tab-item" :class="[current==index ? 'u-tab-item-active' : '']"
				 :data-current="index" @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{item.categoryName}}</text>
				</view>
			</scroll-view>
			<scroll-view scroll-y class="right-box">
					<view class="item-title">
						<text>开启分类后将在首页显示</text>
					</view>
					<view class="page-view">
						<view class="class-item">
							<view class="open-wrap">
								<view class="open-item" v-for="(item, index) in list">
									<view class="label">
										{{item.categoryName}}
									</view>	
									<view class="info">
											<u-switch v-model="item.isStart" @change="switchChange($event,item, index)" :loading="item.isLoading" active-color="#497CD0"></u-switch>
									</view>
								</view>		
								<u-loadmore :status="status" v-if="isLoading"/>
								 <u-empty v-if="!isLoading && !list.length" text="暂无数据" ></u-empty>
							</view>
						</view>
					</view>
				</scroll-view>
		</view>
	</view>
</template>

<script>
	import classifyData from "@/common/js/classify.data.js";
	export default {
		data() {
			return {
				tabbar: classifyData,
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
				navlist:[],
				list:[],
				status: 'loading',
				isLoading: true,
			}
		},
		onLoad(){
			this.getInit();
		},
		computed: {
			
		},
		methods: {
			async getInit() {
				let res = await this.$api.childCategoryList({
					pid: 0
				});
				if (res.data.code == this.$config.RESOK) {
					this.navlist = res.data.data;
					this.getList();
				} else {
					this.$message.error(res.data.msg);
				}
			},
			async switchChange(e, item, index){
				console.log(e);
				this.$set(item, 'isLoading', true)
				const res = await this.$api.updateRecommend({
					...item,
					isStart: e ? 1 : 0,
				 });
				 if (res.data.code == this.$config.RESOK) {
					this.$set(item, 'isLoading', false)
				 } else{
					this.$message.error(res.data.msg);
				 }
			},
			async getList(){
				this.isLoading = true;
				let res = await this.$api.childCategoryList({
					pid: this.navlist[this.current].id
				});
				if (res.data.code == this.$config.RESOK) {
					let list = res.data.data || [];
					list.forEach(item=>{
						item.isStart = item.isStart ? true : false
						item.isLoading = false;
					})
					
					this.list = list;
					this.isLoading = false;
				} else {
					this.$message.error(res.data.msg);
				}
			},
			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if(index == this.current) return ;
				this.current = index;
				// 如果为0，意味着尚未初始化
				if(this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
				}
				// 将菜单菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
				
				this.getList();
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({size: true},res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if(!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return ;
						}
						this[dataVal] = res.height;
					}).exec();
				})
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 18rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 26rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}
	
	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}
	
	.u-tab-item-active::before {
		content: "";
		position: absolute;
		border-left: 4px solid $u-type-primary;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}
	
	.right-box {
		background-color: rgb(250, 250, 250);
	}
	
	.page-view {
		padding: 16rpx;
	}
	
	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}
	
	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
		padding: 4px 20rpx;
		
	}
	
	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		color: $u-main-color;
	}
	
	.item-container {
		display: flex;
		flex-wrap: wrap;
	}
	
	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}
	
	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
	
	
	.open-wrap{
		.open-item{
			display: flex;
			justify-content: space-between;
			padding: 5px 0;
			align-items: center;
		}
	}
	.page-view{
		min-height: 300px;
	}
</style>
